MathSciNet bibliographic data MR1199070 20C20 (20C30 20G05 20G40) Sin, Peter Extensions of simple modules for \$G\sb 2(3\sp n)\$$G\sb 2(3\sp n)$ and \${}\sp 2G\sb 2(3\sp m)\$${}\sp 2G\sb 2(3\sp m)$. Proc. London Math. Soc. (3) 66 (1993), no. 2, 327–357. Article

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